Kyrie and Gloria from a mass for two equal high voices (c'-f", a-f") and a tenor voice, which is based on canonic imitation at the unison between the upper voices all the way through. The musical material in the mass is borrowed from an anonymous three-part rondeau “La plus dolente qui soit née” written for a similar disposition of the voices. The mass is simple and euphonious and an obvious choice for performance with the boys of a maîtrise supported by their maître.